Cytochrome P450 1A1, cigarette smoking, and risk of endometrial cancer (United States)

Monica McGrath, Susan E. Hankinson, Immaculata De Vivo

Research output: Contribution to journalArticlepeer-review


Cytochrome P450 1A1 (CYP1A1) is involved in the metabolism of estradiol and the activation of polycyclic aromatic hydrocarbons found in tobacco products. Polymorphic variation in CYP1A1 activity may modify susceptibility to endometrial cancer through the oxidative metabolism of estradiol and the activation of tobacco-smoke constituents. We prospectively evaluated the associations between three common CYP1A1 polymorphisms and endometrial cancer risk, as well as the potential modification of these associations by cigarette smoking, in a case-control study nested within the Nurses' Health Study. We investigated the MspI restriction-site polymorphism, a C → A transversion at nucleotide 4887 (Thr461Asn) and a A → G transition at nucleotide 4889 (Ile462Val) among 456 women with endometrial cancer and 1,134 matched controls. We used conditional logistic regression to calculate the adjusted odds ratios (OR) and 95% confidence intervals (CI) to quantify the risk of endometrial cancer among subjects who had at least one variant allele compared with that of subjects homozygous for the wild-type allele. We did not observe any statistically significant associations between the MspI, Thr461Asn or Ile462Val polymorphisms and endometrial cancer risk or any significant effect modification by cigarette-smoking status. These data suggest that these three polymorphisms are not important in determining genetic susceptibility to endometrial cancer, although larger sample sizes are needed to confirm these findings.

Original languageEnglish (US)
Pages (from-to)1123-1130
Number of pages8
JournalCancer Causes and Control
Issue number10
StatePublished - Dec 1 2007
Externally publishedYes


  • Cigarette smoking
  • Cytochrome P4501A1
  • Endometrial cancer
  • Epidemiology

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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